Voltage, time-delayed relay
Voltage relay with time-delay function is intendend to be used in protection systems. It allows to control the RMS value of sinewave of voltage with a frequency of 50 Hz. Digital technology provides high accuracy, stability and dependability.

Manuals, diagrams, technical details


Product description

Protection set

27 undervoltage, time-delayed (RET-425P)
59 overvoltage, time-delayed  (RET-425N)

Main features

  • one-phase measuring circuit
  • two types: undervoltage (-P) and overvoltage (-N)
  • measuring and continous diplaying of energising value
  • record of value of voltage during last disturbance
  • LED display and set of buttons in order to operation of the relay
  • optical indicating (with LED diodes) of pick-ups and trips and presence of auxilliary voltage
  • Relay output for pick-up signalling purpose (K1) and trip (K2, K3), watchdog or lack of aux. voltage purpose (K4) or blocked mode signalling (K5)
  • self-test of proper operation of relay
  • relay enclosure gives possibility to mount on 35 mm rail, surface mount or flush mount

RET-425 relay controls the RMS value of input voltage and compares it with setting value. The operation mode depands on type of relay. In overvoltage type (RET-425N), when RMS value of measured voltage exceeds the setting value, pick-up signal is generated and after set time-delay, trip contact closes. The undervoltage type (RET-435P) generates pick-up and trip when measured value drops below setting value.


Rated voltage Un 100V or 220/230V AC/DC
Rated frequency fn 50Hz
Rated auxilliary voltage Up 24V DC, 48V – 60V DC,
110V – 230V DC/AC
Burden of analog inputs ≤0,5VA/input
Burden of auxilliary voltage supply ≤3W
Setting range of threshold voltage (10÷200)V for Un=100V
(15÷300)V for Un=220/230V
Accuracy of voltage input 1,5%
Relay pick-up time ≤60ms
Setting range of timer (0÷99,9)s
Continously voltage withstand of voltage inputs 1,2 Urmax
10 sec voltage withstand of voltage inputs 1,4 Urmax
Relay outputs data
Max. breaking capacity  by U=250V, DC
– resistive load 0,3A
– inductive load by L/R=40ms 0,12A
Max. breaking capacity  by U=250V, 50Hz
– inductive load of cosϕ=0,4 3A
Continuous contact carry 5A
Ambient temperature (268÷313)K/(-5÷40)°C
Relative humidity ≤ 80%
Ingress Protection degree IP40
Weight 0,3kg
Dimensions (height x width x depth) 75 x 45x 120 mm
Electromagnetic compatibility according to PN-EN 50263
Insulation according to PN-EN 60255-5

You need more information?

Contact our Sales Department and talk to our expert about the details.
Your browser is out-of-date!

Update your browser to view this website correctly.Update my browser now